What You Need to Know Before You Start

A hazmat endorsement and a tanker endorsement are two separate additions to your CDL, and you will need to pass a test for each one. The hazmat endorsement lets you haul hazardous materials — chemicals, explosives, radioactive substances, and other regulated cargo. The tanker endorsement lets you haul liquids or gases in bulk tanks, whether hazardous or not. Many drivers get both because the jobs that require one often require the other, but you can get either one on its own.

The process has two parts: first, you pass a written test at your state's DMV or licensing office; second, you pass a background check. For hazmat, the background check is federal and includes fingerprinting. For tanker, the background check varies by state but is usually faster. You cannot haul hazmat or tanker cargo until both the test and the background check are complete.

The timeline depends on your state and the speed of the federal background check. The written test itself takes about 30 minutes, but the background check can take anywhere from a few days to several weeks. Plan to start this process well before you need the endorsement on your license.

Key Takeaways

  • You must pass a separate written test at your state DMV for each endorsement you want — hazmat and tanker are tested separately.
  • Hazmat requires a federal background check with fingerprinting; tanker background checks vary by state but are usually faster.
  • You cannot legally haul the cargo until both your test results and background check are approved and your license is updated.
  • Study materials for both tests are free from the FMCSA (Federal Motor Carrier Safety Administration) and your state DMV website.
  • The entire process from test to approved endorsement typically takes two to six weeks, depending on background check processing time.

Getting Ready for the Hazmat Test

The hazmat test covers how to recognize hazardous materials, how to load and find them, what to do in an emergency, and the rules for placarding and documentation. It is 30 questions, and you need to score at least 80 percent to pass. You get one attempt per visit to the DMV, though you can retake it if you fail.

The FMCSA publishes the official Hazmat Study Guide for free on its website. Your state DMV also usually posts a study guide or a link to the federal one. Read through it once, then take practice tests — many state DMV websites offer free practice exams that use the same question bank as the real test. Spend extra time on the sections about placard requirements and emergency procedures, because those show up frequently.

Bring your current CDL and a valid form of ID to the test. Some states require you to bring your Social Security card or passport as well. Check your state's DMV website for the exact list before you go.

Getting Ready for the Tanker Test

The tanker test covers the physics of liquid surge and sloshing, how to load and unload safely, brake and handling differences when hauling liquids, and the rules specific to your state. It is also 30 questions, and you need at least 80 percent to pass. Like hazmat, you get one attempt per visit and can retake it if you fail.

Your state DMV publishes a tanker study guide — this one is usually state-specific because tanker rules vary more than hazmat rules do. read it from your state's CDL page and work through it. The physics section (surge and sloshing) is the part most drivers find hardest, so spend time understanding why a half-full tank is more dangerous than a full one. Practice tests are less common for tanker than for hazmat, but your state DMV may have sample questions on its website.

Bring the same ID documents you brought for hazmat. If you are taking both tests on the same day, you can do that — just let the DMV know when you schedule or arrive.

The Background Check Process for Hazmat

After you pass the hazmat test, your state DMV sends your information to the Transportation Security Administration (TSA). The TSA runs a federal background check that includes fingerprinting. You will be notified where and when to go for fingerprinting — this is usually at a local police station, sheriff's office, or a private fingerprinting service contracted by TSA.

The fingerprinting appointment is quick, usually 10 to 15 minutes. Bring a valid photo ID. The TSA then checks your fingerprints against FBI and other federal databases. This process typically takes one to three weeks, though it can take longer if there are delays or if additional review is needed.

Once the TSA approves you, your state DMV is notified and your hazmat endorsement is added to your license. You will receive your updated license in the mail. Do not haul hazmat cargo until you have the physical license in hand with the endorsement printed on it.

The Background Check Process for Tanker

Tanker background checks are handled by your state, not the federal government. After you pass the tanker test, your state DMV runs a check — usually a criminal background check and a driving record review. Some states also check your employment history. The process is faster than hazmat because there is no federal fingerprinting step.

Most states complete the tanker background check within a few days to a week. Your state DMV will notify you by mail or email when you are cleared, and your endorsement will be added to your license. Like hazmat, you cannot legally haul tanker cargo until the endorsement appears on your physical license.

If you are denied a tanker endorsement, your state will tell you why. The reasons are usually related to your driving record or criminal history. You have the right to request a review or appeal, depending on your state's rules — contact your state DMV for details.

What Happens If You Fail the Test

If you do not score at least 80 percent on either test, you fail that test. You can retake it, but you usually have to wait a set number of days (often 7 to 14 days) before your next attempt. Each attempt may have a small fee — check your state's DMV website for the cost.

If you fail multiple times, some states require you to take a CDL training course before you can test again. This is not common, but it is worth asking your DMV if you fail twice. Do not be discouraged — most drivers pass on the second or third attempt if they study the material carefully.

Timeline and Next Steps

Here is what to expect from start to finish. You study for one to two weeks, then take the written test (or tests, if you are doing both). If you pass, you move into the background check phase. For hazmat, you get fingerprinted within a week or two, then wait one to three weeks for TSA approval. For tanker, approval usually comes within a week. In total, plan for two to six weeks from the day you pass the test to the day your updated license arrives.

Once your endorsement is on your license, you are legal to haul that cargo. Your employer will likely want to see your license before assigning you to those routes. Keep your license in a safe place — if you lose it, you will have to pay for a replacement and cannot haul hazmat or tanker cargo until you have it.

If you move to a different state, your hazmat and tanker endorsements move with you. You do not have to retake the tests or background checks — your new state will recognize them as long as they are valid on your old license.

Frequently Asked Questions

Can I take the hazmat and tanker tests on the same day?

Yes. Schedule both tests at your state DMV and take them back-to-back. You will need to pass both to get both endorsements, but there is no rule against testing for them at the same visit. This can save you time if you need both.

What disqualifies you from getting a hazmat endorsement?

The TSA will deny hazmat based on certain criminal convictions, immigration violations, or security concerns. Specific crimes related to explosives, weapons, or terrorism are automatic disqualifiers. If you have a criminal record, contact the TSA or your state DMV before you test to find out whether you are may be able to access.

Do I have to renew my hazmat and tanker endorsements?

Yes. Hazmat endorsements expire every five years and require a new TSA background check to renew. Tanker endorsements renew with your CDL, usually every four to eight years depending on your state. You will receive a notice in the mail before your endorsement expires.

What if the TSA denies my hazmat background check?

You have the right to appeal. The TSA will send you a letter explaining why you were denied. You can request a hearing or submit additional information to challenge the decision. Contact the TSA's hazmat endorsement program for the appeal process.

Can I haul hazmat or tanker cargo with a permit while I wait for my endorsement?

No. You must have the endorsement on your physical CDL to legally haul that cargo. There is no temporary permit or provisional endorsement. You can only haul these materials once your updated license arrives.